Hello,everyone!
In following tutorial,I  see how to implement a mechanism for reading osg 
resources -- such as images, osg and ive files, fonts, etc. -- from a virtual 
file system.
http://www.openscenegraph.org/projects/osg/wiki/Support/Tutorials/VFS
I finish the code according to that tutorial--ReaderPhysFS.cpp!It can be 
compile and run right(having two files:osgdb_physfsd.dll,osgdb_physfs.dll).But 
when I read file,it is wrong!!The cessna.osg is the model of OSGData.
Can you tell me why??Thank you!
 
osgDB::Registry::instance()->addFileExtensionAlias("physfs","physfs");
 osg::Group* root = new osg::Group();
 std::string fileName = "cessna.osg";
 osg::Node* node = osgDB::readNodeFile(fileName + ".physfs");
 
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